Environment-Stable Co(x)Ni(y) Encapsulation in Stacked Porous Carbon Nanosheets for Enhanced Microwave Absorption

Magnetic/dielectric@porous carbon composites, derived from metal–organic frameworks (MOFs) with adjustable composition ratio, have attracted wide attention due to their unique magnetoelectric properties. In addition, MOFs-derived porous carbon-based materials can meet the needs of lightweight feature. This paper reports a simple process for synthesizing stacked Co(x)Ni(y)@C nanosheets derived from Co(x)Ni(y)-MOFs nanosheets with multiple interfaces, which is good to the microwave response. The Co(x)Ni(y)@C with controllable composition can be obtained by adjusting the ratio of Co(2+) and Ni(2+). It is supposed that the increased Co content is benefit to the dielectric and magnetic loss. Additionally, the bandwidth of CoNi@C nanosheets can take up almost the whole Ku band. Moreover, this composite has better environmental stability in air, which characteristic provides a sustainable potential for the practical application. [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s40820-020-00432-2) contains supplementary material, which is available to authorized users.